Because a good propagandist does two things:

1. Ground the argument in some vestige of reality (the reliance on statistics is very strong). 2. Point out the opposing denial of reality (magical thinking, social constructionism, blank slate lunacy) in order to push the radically opposite perspective without nuance.

This is inherently isolating but also makes the adherents feel very powerful. Think pieces like this do not oppose but rather support the cause they purport to be against, since the ideological leanings of the writer are plainly obvious and their own denials of reality stick out like a sore thumb.

As long as the political left is dominated by social constructionism and other lunacy, the alt-right will never be exterminated. The task ahead of us is not trivial.